In an interrupt driven input/output __________

A. The cpu uses polling to watch the control bit constantly, looping to see if a device is ready
B. The cpu writes one data byte to the data register and sets a bit in control register to show that a byte is available

C. The cpu receives an interrupt when the device is ready for the next byte

D. The cpu runs a user written code and does accordingly

Occurrence: 0, System Administrator 2026